MIAG Fahrzeugbau GmbH | Einsatzbereiche

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ATEX Device Class

Group I
In mining at exposure to coal mine gas/dust

Group II
All other Ex-Areas

Combustible materials as mixture with air	Duration of presence of hazardous explosive atmosphere
Combustible materials as mixture with air	Continuously, for long periods or frequently (>1.000 h/Year)*	Occasionally (10 – 1.000 h/year)*	Never or momentary (<10h/Year)*
Gas, vapors, mists	Zone 0	Zone 1	Zone 2
Dusts	Zone 20	Zone 21	Zone 22

* The periods indicated are approximate, not standardized and only serves as rough clues

More rules of thumb to understand "all the time, for long periods or frequently", "occasionally" and "short term":

Continuously, for long periods or frequently: time mainly based on the effective operating time (> 50%)
Short time: a few times a year for about 30 minutes
Occasional: what is not covered by the criteria about "long periods" or "frequently"